Bit-stock



I (.No Model) 'J. W, BRITTIN.

Bit Stock.

No. 241,920. Patented May 24, 1881..

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JOHN WV. 'BRITTIN, OF BLACK ROCK, CONNECTICUT.

BIT-STOCK.

SPECIFICATION forming part of Letters Patent No. 241,920, dated May 24,1881.

Application filed February 28, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN W. BRI'ITIN, acitizen of the United States, residing at Black Rock, in the county ofFairfield and State of Connecticut, have invented new and usefulImprovements in Bit-Stocks, of which the following is a specification.

This invention relates to that class of bitstocks comprising a slottedtube open at one end, a bit-socket arranged in the tube, and aset-screwprojecting through the slot of the tube for clamping thebit-socket in the desired position, the extent to which the bit projectsfrom the tube determining the depth of the hole that is bored by itsmeans.

My invention consists in the arrangement of an annular rotating head onthe open end of the tube, for the purpose of avoiding injury to thesurface of the wood by the contact of the tube with it. The rotatinghead is provided with side openings for the escape of woodcuttings.

It also consists in the arrangement of screws in the tube for thepurpose of steadying the bit; further, in a certain novel constructionof the bit-socket, hereinafter fully explained.

This invention is illustrated in the accompanying drawings, in whichFigure 1 repre sents alongitudinal section. Fig. 2 is acrosssection onthe line 0000, Fig. 1. Fig. 3 is a similar section on the line y y, Fig.1.

Similar letters indicate corresponding parts.

The letter A designates the tube; B, its slot; C, the bit-socket, and Dthe set-screw for the socket. The slot B extends nearly the entirelength of the tube A, and the latter is open at one end, the other endthereof being closed, and being provided with a polygonal head, 5, forits engagement with a brace. The bitsocket C is constructed to receivethe tail end of the bit, (marked 13,) and it is set by the screw D(which projects through the slot B) to retain thebit in the desiredposition.

When the bit is applied to use the lower or open end of the tube A comesin contact with the surface of the wood, thus determining the depth ofthe hole; and in order to avoid injury to the wood by such contact Iarrange on the open end of the tube an annular head, F, which is capableof rotating thereon, or, in other words, allowing a rotary motion of thetube independently thereof. This rotating head F thus is the part of thetube coming in contact with the wood, and inasmuch as the head at onceremains stationary upon its surface this surface is left uninjuredthereby. I prefer to make the head F to flare in a downward directionaway from the tube in order to obtain a broad base, and its connectionwith the tube is effected by means of screws 6 passing radially throughthe head and entering a circumferential groove, 7, in thetube. When thehead F approaches the wood a portion of the cuttings enter the head, andto permit their escape therefrom the head is provided with sideopenings, 8, of suitable size and shape.

When the lower part or shank of the bit E is left unsustained in thetube it is liable to shake or become thrown out of the center, and toavoid this danger I make use of screws Gr, which pass radially throughthe side of the tube and impinge against the bit at their inner ends,thus effectually steadying the bit. These screws G are simply retractedwhen it is desired to change the position of the bit, and then againforced up against it.

The bit-socket C is divided into two parts, and an eye, H, formed on theshank of the setscrew D, is fitted on it. This eye H is held by orbetween a shoulder, 10, formed on the socket, and a ring, I, which isattached to the socket by a screw, J, passing through the ring andthrough both parts of the socket. This screw J thus serves not only toretain the ring I in its position, but also to connect the divisions ofthe socket in a longitudinal direction. The inner diameter of the eye Hand ring I is larger than the outer diameter of the socket opposite tothese parts, and by this arrangement the divisions of the socket areallowed to separate to a suificient extent for the removal of the bit,while when the set-screw D is tightened the eye tends to compress suchdivisions on the bit. The screw D is set by a thumb-nut, 9, having asuitable washerinterposed between it and the tube.

What I claim as new, and desire to secure by Letters Patent, is-

1. The tube A, having at its lower open end the loosely-attached rotaryhead F, and at its upper end the angular head for connecting it with anordinary brace, said tube and head being constructed to surround the bitwhen in ing screws, in combination with the bit-socket use,substantially as described, for the purpose set forth.

2. The combination, with the tube A, having means to connect it with abrace, and provided on its interior with an adjustable bitsocket, of anannular rotary head, F, loosely connected with the open lower end of thetube, through which the bit extends and rotates independently of saidhead, substantially as described, for the purposes set forth.

3. The slotted tube, having at its lower open end an annular rotatinghead provided with side openings, in combination with the bit socket andits set-screw, said tube and head surrounding the bit, substantially asand for the purpose described.

4. The slotted lube provided withbit-steadvand its set-screw, allarranged for use substantially as described.

5. In combination with the slotted tube A, the bit-socket (l, composedof two vertical sections having shoulders 10, the stationary ring I, andthe set-screw D, having the eye II arranged upon the socket between theshoulders and the ring, substantially: s and for the purpose described.

In testimony whereot'l have hereunto set my hand and seal in thepresence of two subscribing" witnesses.

JOHN \V. BRITTIN.

